Christmas Island’s narrow reef supports bountiful marine life, including 88 coral species and more than 600 species of fish. It’s an underwater wonderland for divers, with clear warm waters, coral reefs and spectacular wall dives. Soft corals, feather stars and gorgonian corals grow along vast walls which plunge into a seemingly bottomless abyss. The fish community is distinctive because the island is a meeting place for Indian and Pacific Ocean fish species. It’s one of the few locations in the world where you’ll see Indian and Pacific Ocean fish swimming side by side. Some of these species interbreed to produce hybrids. Christmas Island has more hybrid fish than anywhere else in the world, making it a marine hybridisation zone of international significance. In addition to the hundreds of species of tropical fish, dolphins inhabit the island’s waters and whale sharks regularly visit during the wet season. Whale sharks generally first appear when the red crabs are spawning at the start of the wet season — they converge to supplement their plankton diet with crab larvae. Locations like Flying Fish Cove, Ethel Beach, Dolly Beach, West White Beach and Winifred Beach offer scuba divers and snorkellers a rewarding marine experience. At Flying Fish Cove and Ethel Beach shore diving is possible depending on the time of the year. There is excellent fishing, with sailfish, tuna and wahoo among some of the fish to be caught. You’ll find boat ramps at Flying Fish Cove and Ethel Beach.

Sustainable tourism is not only about being environmentally friendly, but also about respecting the cultural heritage of the destination. In Canberra, you can immerse yourself in one of the oldest and richest cultures in human history. Appreciate the Aboriginal and Torres Strait Islander art and traditions at the National Gallery of Australia, Burrunju Art Gallery and Aboriginal Dreamings Gallery. Take a tour with a local Ngunnawal elder with Dhawura Tours or try your hand at traditional First Nations practices at a workshop at the National Arboretum.

The city's most staggering discovery is the brutalist National Library building, a structure so bizarre and seemingly out of place that many are left unsure as to what to make of it. It still is a perfectly functional library, so do drop in to get a good look at what's inside – you might just chance upon an English-language exhibition.

Although Hoi An is perfectly walkable, cycling is an easy way of getting around, if your itinerary extends beyond the Old Town (including An Bang Beach). The Hoi An Old Town is closed off to all motorised traffic (including motorbikes) on most days, between 8.30 and 11.00 and then again 15.00 to 21.30, which means streets can be comfortably navigated by cyclists and pedestrians. Many hotels and guest houses offer bike rental services (or even complimentary bicycle use in some cases), but multiple bike rental shops operate throughout town as well. Prices are normally very reasonable and can be as low as 1 USD per day (depending on the bike). Single-gear bikes will suffice for cycling through town, but mountain bikes are recommended for those who wish to venture into the countryside. While locals will often be seen riding without helmets on, we recommend asking for one at your bike hire provider to ensure safety.